EVIDENCES FOR ELASTIC ISOTROPY AND ULTRASONIC-ATTENUATION ANISOTROPY IN AL-MN-PD QUASI-CRYSTALS

被引：62

作者：

AMAZIT, Y ^{[1
]}

DEBOISSIEU, M ^{[1
]}

ZAREMBOWITCH, A ^{[1
]}

机构：

[1] ENS ELECTROCHIM & ELECTROMET GRENOBLE,LTPM,CNRS,UA 029,F-38402 ST MARTIN DHERES,FRANCE

来源：

EUROPHYSICS LETTERS | 1992年 / 20卷 / 08期

关键词：

D O I：

10.1209/0295-5075/20/8/007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Very accurate ultrasonic experiments have been performed to check the elastic isotropy of Al-Mn-Pd quasi-crystals. The velocities of ultrasonic waves propagating. along a twofold or a fivefold axis have been found equal to (6521 +/- 10) m.s-1 for longitudinal waves and (3292 +/- 3) m.s-1 for shear waves. The accuracy of these measurements is one order of magnitude better than previous results. In addition, when the polarization of the shear waves propagating along a twofold axis is changed, the velocity is constant within an experimental uncertainty of 10(-4). In this paper, we also report the first experimental evidence for anisotropic ultrasonic attenuation. Such an anisotropy is expected to occur for instance if phasons and phonons are coupled in the crystal.

引用

页码：703 / 706

页数：4

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